FFmpeg
roqvideo.c
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1 /*
2  * Copyright (C) 2003 Mike Melanson
3  * Copyright (C) 2003 Dr. Tim Ferguson
4  *
5  * This file is part of FFmpeg.
6  *
7  * FFmpeg is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * FFmpeg is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with FFmpeg; if not, write to the Free Software
19  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20  */
21 
22 /**
23  * @file
24  * id RoQ Video common functions based on work by Dr. Tim Ferguson
25  */
26 
27 #include "avcodec.h"
28 #include "roqvideo.h"
29 
30 static inline void block_copy(unsigned char *out, unsigned char *in,
31  int outstride, int instride, int sz)
32 {
33  int rows = sz;
34  while(rows--) {
35  memcpy(out, in, sz);
36  out += outstride;
37  in += instride;
38  }
39 }
40 
41 void ff_apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
42 {
43  unsigned char *bptr;
44  int boffs,stride;
45 
46  stride = ri->current_frame->linesize[0];
47  boffs = y*stride + x;
48 
49  bptr = ri->current_frame->data[0] + boffs;
50  bptr[0 ] = cell->y[0];
51  bptr[1 ] = cell->y[1];
52  bptr[stride ] = cell->y[2];
53  bptr[stride+1] = cell->y[3];
54 
55  stride = ri->current_frame->linesize[1];
56  boffs = y*stride + x;
57 
58  bptr = ri->current_frame->data[1] + boffs;
59  bptr[0 ] =
60  bptr[1 ] =
61  bptr[stride ] =
62  bptr[stride+1] = cell->u;
63 
64  bptr = ri->current_frame->data[2] + boffs;
65  bptr[0 ] =
66  bptr[1 ] =
67  bptr[stride ] =
68  bptr[stride+1] = cell->v;
69 }
70 
71 void ff_apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
72 {
73  unsigned char *bptr;
74  int boffs,stride;
75 
76  stride = ri->current_frame->linesize[0];
77  boffs = y*stride + x;
78 
79  bptr = ri->current_frame->data[0] + boffs;
80  bptr[ 0] = bptr[ 1] = bptr[stride ] = bptr[stride +1] = cell->y[0];
81  bptr[ 2] = bptr[ 3] = bptr[stride +2] = bptr[stride +3] = cell->y[1];
82  bptr[stride*2 ] = bptr[stride*2+1] = bptr[stride*3 ] = bptr[stride*3+1] = cell->y[2];
83  bptr[stride*2+2] = bptr[stride*2+3] = bptr[stride*3+2] = bptr[stride*3+3] = cell->y[3];
84 
85  stride = ri->current_frame->linesize[1];
86  boffs = y*stride + x;
87 
88  bptr = ri->current_frame->data[1] + boffs;
89  bptr[ 0] = bptr[ 1] = bptr[stride ] = bptr[stride +1] =
90  bptr[ 2] = bptr[ 3] = bptr[stride +2] = bptr[stride +3] =
91  bptr[stride*2 ] = bptr[stride*2+1] = bptr[stride*3 ] = bptr[stride*3+1] =
92  bptr[stride*2+2] = bptr[stride*2+3] = bptr[stride*3+2] = bptr[stride*3+3] = cell->u;
93 
94  bptr = ri->current_frame->data[2] + boffs;
95  bptr[ 0] = bptr[ 1] = bptr[stride ] = bptr[stride +1] =
96  bptr[ 2] = bptr[ 3] = bptr[stride +2] = bptr[stride +3] =
97  bptr[stride*2 ] = bptr[stride*2+1] = bptr[stride*3 ] = bptr[stride*3+1] =
98  bptr[stride*2+2] = bptr[stride*2+3] = bptr[stride*3+2] = bptr[stride*3+3] = cell->v;
99 }
100 
101 
102 static inline void apply_motion_generic(RoqContext *ri, int x, int y, int deltax,
103  int deltay, int sz)
104 {
105  int mx, my, cp;
106 
107  mx = x + deltax;
108  my = y + deltay;
109 
110  /* check MV against frame boundaries */
111  if ((mx < 0) || (mx > ri->width - sz) ||
112  (my < 0) || (my > ri->height - sz)) {
113  av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
114  mx, my, ri->width, ri->height);
115  return;
116  }
117 
118  if (!ri->last_frame->data[0]) {
119  av_log(ri->avctx, AV_LOG_ERROR, "Invalid decode type. Invalid header?\n");
120  return;
121  }
122 
123  for(cp = 0; cp < 3; cp++) {
124  int outstride = ri->current_frame->linesize[cp];
125  int instride = ri->last_frame ->linesize[cp];
126  block_copy(ri->current_frame->data[cp] + y*outstride + x,
127  ri->last_frame->data[cp] + my*instride + mx,
128  outstride, instride, sz);
129  }
130 }
131 
132 
133 void ff_apply_motion_4x4(RoqContext *ri, int x, int y,
134  int deltax, int deltay)
135 {
136  apply_motion_generic(ri, x, y, deltax, deltay, 4);
137 }
138 
139 void ff_apply_motion_8x8(RoqContext *ri, int x, int y,
140  int deltax, int deltay)
141 {
142  apply_motion_generic(ri, x, y, deltax, deltay, 8);
143 }
stride
int stride
Definition: mace.c:144
roqvideo.h
out
FILE * out
Definition: movenc.c:54
RoqContext::current_frame
AVFrame * current_frame
Definition: roqvideo.h:44
RoqContext
Definition: roqvideo.h:40
roq_cell::y
unsigned char y[4]
Definition: roqvideo.h:28
RoqContext::avctx
AVCodecContext * avctx
Definition: roqvideo.h:42
ff_apply_motion_8x8
void ff_apply_motion_8x8(RoqContext *ri, int x, int y, int deltax, int deltay)
Definition: roqvideo.c:139
roq_cell
Definition: roqvideo.h:27
block_copy
static void block_copy(unsigned char *out, unsigned char *in, int outstride, int instride, int sz)
Definition: roqvideo.c:30
RoqContext::height
int height
Definition: roqvideo.h:45
AVFrame::data
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:317
AV_LOG_ERROR
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:181
ff_apply_vector_2x2
void ff_apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
Definition: roqvideo.c:41
roq_cell::v
unsigned char v
Definition: roqvideo.h:29
ff_apply_vector_4x4
void ff_apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
Definition: roqvideo.c:71
RoqContext::last_frame
AVFrame * last_frame
Definition: roqvideo.h:43
avcodec.h
ff_apply_motion_4x4
void ff_apply_motion_4x4(RoqContext *ri, int x, int y, int deltax, int deltay)
Definition: roqvideo.c:133
roq_cell::u
unsigned char u
Definition: roqvideo.h:29
AVFrame::linesize
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:334
av_log
#define av_log(a,...)
Definition: tableprint_vlc.h:28
apply_motion_generic
static void apply_motion_generic(RoqContext *ri, int x, int y, int deltax, int deltay, int sz)
Definition: roqvideo.c:102
RoqContext::width
int width
Definition: roqvideo.h:45